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Multiple-ratio automatic transmission control method and system for ratio upshifts

  • US 8,529,406 B2
  • Filed: 11/30/2012
  • Issued: 09/10/2013
  • Est. Priority Date: 01/25/2010
  • Status: Active Grant
First Claim
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1. A multiple-ratio transmission wherein a powertrain source provides an input torque to the transmission, the transmission comprising:

  • oncoming and off-going clutches for effecting ratio shifts;

    a controller, during a ratio upshift event, configured to;

    increase torque capacity of the oncoming clutch while torque capacity of the off-going is reduced and maintained locked;

    increase the input torque during a torque phase before start of an inertia phase; and

    decrease transmission input torque at a controlled rate during the inertia phase;

    thereby minimizing torque transients along the output shaft during the upshift.

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